v3.20.1
Document and Entity Information
Jun. 03, 2020
Entity Listings [Line Items]  
Document Type 8-K
Amendment Flag false
Document Period End Date Jun. 03, 2020
Entity Registrant Name NuStar Energy L.P.
Entity Incorporation, State or Country Code DE
Entity File Number 001-16417
Entity Tax Identification Number 74-2956831
Entity Address, Address Line One 19003 IH-10 WEST
Entity Address, City or Town SAN ANTONIO
Entity Address, State or Province TX
Entity Address, Postal Zip Code 78257
City Area Code 210
Local Phone Number 918-2000
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Entity Emerging Growth Company false
Entity Central Index Key 0001110805
Common Stock [Member]  
Entity Listings [Line Items]  
Title of 12(b) Security Common units
Trading Symbol NS
Security Exchange Name NYSE
Series A Preferred Stock [Member]  
Entity Listings [Line Items]  
Title of 12(b) Security Series A Fixed-to-Floating Rate Cumulative Redeemable Perpetual Preferred Units
Trading Symbol NSprA
Security Exchange Name NYSE
Series B Preferred Stock [Member]  
Entity Listings [Line Items]  
Title of 12(b) Security Series B Fixed-to-Floating Rate Cumulative Redeemable Perpetual Preferred Units
Trading Symbol NSprB
Security Exchange Name NYSE
Series C Preferred Stock [Member]  
Entity Listings [Line Items]  
Title of 12(b) Security Series C Fixed-to-Floating Rate Cumulative Redeemable Perpetual Preferred Units
Trading Symbol NSprC
Security Exchange Name NYSE